If you see an audio and MIDI sync alert in Logic Pro X

Learn what to do if you see “Error while trying to synchronize Audio and MIDI” when using Logic Pro X.

Logic Pro gives this alert when the sample rate of an incoming audio signal doesn't match the project's sample rate, or if the sample rate fluctuates. It appears most often when using an external audio interface, an external sync device, or plug-ins.

Follow the recommendations in this article to keep the alert from interrupting your session. After each recommendation, try playing back your project to see if the alert still appears. If it does, try the next recommendation until the alert no longer appears.

Check sample rate settings

When using an external audio interface with Logic Pro, the sample rate for your interface should adjust automatically to match the sample rate of your project. Sometimes, however, sample rate settings might not match. Check to make sure the sample rate settings match.

Check the sample rate on your external interface

Most external audio interfaces have an application (usually accessible in System Preferences or in the Applications folder on your Mac) that lets you view and change hardware settings, including the device's sample rate. See the documentation for your device for more information.

If your project’s sample rate does match your interface’s sample rate, select a different sample rate from the Sample Rate pop-up menu, then set it back to the original sample rate.

Check clock settings on digital devices

If you’re using an external audio interface with a digital device connected to it, make sure to designate only one interface as the master clock. See the documentation for your interface for more information.

If alerts don’t appear, you might need to update or service your audio interface. Contact the manufacturer for support.

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